package com.heima.media.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.dto.PageResponseResult;
import com.heima.common.dto.ResponseResult;
import com.heima.media.dto.ChannelDto;
import com.heima.media.entity.WmChannel;
import com.heima.media.mapper.WmChannelMapper;
import com.heima.media.service.IWmChannelService;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

@Service
public class WmChannelServiceImpl extends ServiceImpl<WmChannelMapper, WmChannel> implements IWmChannelService{
    @Override
    public ResponseResult listByName(ChannelDto dto) {
        //根据名称分页查询频道列表
        //构建查询条件
        LambdaQueryWrapper<WmChannel> query = new LambdaQueryWrapper<>();
        //判断传入的频道名称是否为空，不为空的话添加查询条件
        if(!StringUtils.isEmpty(dto.getName())){
            query.like(WmChannel::getName,dto.getName());
        }
        //构建分页条件
        IPage<WmChannel> page =new Page<>(dto.getPage(),dto.getSize());
        IPage<WmChannel> iPage = this.page(page, query);
        //给前端返回通用的分页响应
        PageResponseResult result = new PageResponseResult(dto.getPage(),dto.getSize(),
                iPage.getTotal(),iPage.getRecords());
        return result;
    }
}
